/* 编辑器 */
#md-editor {
    position: absolute;
    top: 100px;
    right: 0;
    bottom: 0;
    left: 0;
    font-size: 16px;
}

/* 预览框 */
#md-viewer {
    position: absolute;
    top: 100px;
    right: 0;
    bottom: 0;
    left: 50%;
    overflow-y: scroll;
}
header{
    width: 100%;
    height: 100px;
    border-bottom: 1px solid gray;
}
